30 x 31 x 32 x 33 x 35 x a = 33390 x 20.

30 x 31 x 32 x 33 x 35 x a = 667800.

                                    a = 667800 : ( 30 x 31 x 32 x 33 x 35 ).

                                    a = 667800 : 34372800.

                                    a = 0,0194... ( chia dư mãi ).

Kích mình nha!!!

1. Lan visited her friend and ate our in a _ _ _ _ _ _ _ _ _ _ with them.

2. The room will look brighter if there is a _ _ _ _ _ _ _ _ on the wall.

3. American students have more vacations than Vietnamese _ _ _ _

I spend two hours _ _ _ _ day doing my homework.